160 CONTRIBUTIONS 



ribbed and has the seat of the canal raised, terminating 

 near the beak it differs from the R. decussata (Lamarck), 

 which is largely ribbed and striate, and has the inferior 

 sinus of the Strombus in the outer lip, and it differs from the 

 R. pes-pelecani (Lamarck), which has the outer lip divided 

 into three digitate processes. 



R. Cuvieri* Plate 5. Fig. 165. 



Description. Shell subfusiform, truncate below, longitu- 

 dinally folded and striate ; substance of the shell thick ; 

 spire elevated, suture linear ; whorls about eight, very 

 slightly convex ; canal at the base very short, above 

 erect, terminating half way up the spire ; columella thick- 

 ened, reflected ; mouth contracted ; outer lip truncate 

 below, thickened, edged. 



Length .7, Breadth .3, of an inch. 



Observations. This species differs in most of its cha- 

 racters from the last. It most resembles the fissurella 

 (Lamarck). The superior canal does not, however, as in 

 that shell, extend to the apex. The inferior canal is shorter. 

 The ribs or folds are not so strong, and the outer lip is 

 smaller and not reflected. 



This genus has a considerable range in the strata of 



* In honour of one of the great masters of natural science, I dedicate 

 this small but interesting species. No praise from me could add to the 

 memory of one so illustrious. I place it alongside of that of Lamarck. 



